Cylinder grinder



April 1936- M. KAMINSKY 2,038,295

CYLINDER GRINDER Filed Dec. 17, 1954 35 INVENTOR Michael Kammshy.

AZRNEY Patented Apr. 21, 1936 UNITED STATES PATENT OFFICE 2,038,295 I CYLINDER Gamma Michael Kaminsky, New Britain, Conn. Application December 17, 1934, Serial no. 157,809 I 15 Claims. (01. 51-1843) indicating the exact size to which the grinding tool has been set to operate.

A further object is to provide a grinding tool of the above naturewhich will be comparatively simple in construction, inexpensive to manufacture, easy to install and manipulate, compact, and very eflicient and durable in use. i

With these and other objects in view, there has been illustrated on the accompanying drawing, one form in which the invention may be conveniently embodied in practice.

In the drawing: 7

Fig. 1 represents a side elevation. of the improved grinding tool. I

Fig. 2 is a vertical sectional view of the same on an enlarged scale, taken along the line 2-2 of Fig. 1.

Fig. 3 is a transverse sectional view of the adjusting nut oi the grinding tool, taken along the line 3-3 of Fig. 2. r

Fig. 4 is a transverse sectional view of the grinding head, taken along the line 4-4 of Fig. 2.

Fig. 5 is a perspective view of the slotted expansion mandrel employed in the tool.

Referring now to the drawing in which like reference numerals denote corresponding parts throughout the several views, the numeral III indicates a cylindrical spindle shaft having an intermediate threaded section II and an upper reduced shank l2 for connection, as through a universal coupling, not shown, to any suitable power unit, such as an electric motor, not shown. Slidably fitted over the shaft I is an adjusting mandrel I! having an exterior tapered section H and a cylindrical bore i 5, said mandrel being adapted to be moved along said shaft by means of a manually operated circular adjusting nut IS engaging the threaded portion ll of said shaft.

The nut 18 is held upon said mandrel against longitudinal movement relative therewith by means of a pair 01' diametrically opposed radial pins ll located in suitable recesses It provided in the wall oi the nut ll. The pins H are adapted to project inwardly into engagement with an annular groove i9 formed in the adjacent end of the mandrel l3, and said plus I! are held in their respective positions by means or a split spring ring 20 fitting in an annular groove 2| provided in the surface of said nut IS. The lower end of the adjusting nut I6 is provided with a beveled flange 22 having a pointed reference mark 24, for cooperating with a scale 25 on a beveled dial plate 26, the latter being seated on a shoulder 21 and rigidly secured to said mandrel, as by a driving fit.

In order to provide means for changing the effective diameter of the abrading units of the grinding head, theintermediate section of the i5 spindle shaft I 0 is provided with two pairs of guide pins 28 and 29 transversely disposed in the shaft, the pins 28 being located at right-angles to the pins 29. The tapered portion ll of the mandrel i3 is provided with four symmetrically spaced longitudinal slots 30, through which the guide pins 28 and 29 transversely extend. The outer extremities of the pins 28 and 29 are adapted to engage in radial openings 3| provided in a set of four expansible sector blocks 32, forming an inner tube. The mandrel I3 is adapted to slide longitudinally with respect to the sector blocks 32, causing thelatter to expand or contract as the case maybe.

The interior surfaces of the sector blocks 32 are 0 beveled to engage the surface of the tapered mandrel I3, and said blocks are held tightly upon said mandrel by means of a plurality of split spring bands 33, embracing said sectors 32 and fitting in circumferential grooves 34 provided 35 therein. I

A plurality of' arcuate shoe members 35 (four in this instance) are provided for supporting and carrying the same number of abrasive stones 36. The abrasive-carrying shoes 35 are adapted to be held in radially slidable spaced relation with respect to said sector blocks 32 by means of two sets of bushings 31 threadedly engaged in said sector blocks, and having tapped cylindrical radially projecting sections 38. Each of the shoe members 35 is provided with a pair of upper and lower integral tubular sleeves 39 telescopically and slidably fitted over the cylindrical tapped sections 38 of the bushings 31.

Each of the shoe members 35 is resiliently held outwardly from the sector blocks 32 by means of a pair of helical compression springs 40, one of which surrounds each of saidsleeves 39 and is adapted to press said shoe members 35 against enlarged notched or serrated heads ll 01' stop screws 42 threadedly engaged in the tapped sections 38 of the bushings 31. The heads 4| of the screws 42, shown in Figs. 2 and 4, are adapted to seat in sockets 43 provided on the exterior surface of the shoe members 35.

It is to be noted from the above construction that the arcuate shoes 35 are yieldable inwardly with respect to the sector blocks 32, and are limited in their outward movement by the headed stop screws 42. The stop screws are also adapted to be held in adjusted position by means of small elongated locking screws 44 adapted to be inserted in the arcuate shoes 35 from opposite ends thereof, and having pointed ends engaging the notched sections of the screw heads 4|. The screws 44 and shoes 35 are thus permitted to move radially with respect to the stop screws 42.

The helical abrasive stones 36 are fitted into similar-shaped channel trays 45 located on'the exterior surface of the shoes 35. As shown in Fig. 1, the channel trays 45 are made to extend a slight distance beyond the ends of the abrasive stones 36 to permit said trays to be detachably secured to the shoes 35 by means of screws 46.

Operation In operation, when it is desired to use the tool for grinding a cylinder, the compression of the springs 40 which engage the abrasive-carrying shoe members 35 will first be adjusted by turning the stop screws 42 as far as necessary. Then in order to permit the grinding head to be easily inserted into the cylinder bore prior to the grinding operation, the circular adjusting nut I5 will be manually rotated in the direction to move it upwardly on-the thread ll of the shaft ID. This will cause the mandrel l3 to also rise, and the split spring bands 33 will contract the sector blocks 32 and the shoes 35 until the desired reduction in diameter has been reached. When the grinding head has been thus adjusted, it will be inserted in the cylinder, and by manipulating the nut l6 in the reverse direction, the abrasive stones 36 will be forced outwardly into engagement with the walls of the cylinder bore. When this has been accomplished, the setting on the dial plate 26 will be noted, and the nut l6 will be turned the proper amount as indicated by the scale 25 to produce a predetermined increase of diameter in the cylinder bore by the grinding operation. This will cause the springs 40 to be compressed and exert pressure upon the abrading stones 36, and cause the interior of the bore to be ground by the rotation of the spindle shaft l0 until the shoes 35 abut against the heads 4| of the stop screws 42.

While there has been disclosed in this specification one form in which the invention may be embodied, it is to .be understood that this form is shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosure but may be modified and embodied in various other forms without departing from its spirit. .In short, the invention includes all the modifications and embodiments coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new and for which it is desired to secure Letters Patent, is:

1. In a grinding tool, a spindle member, an exteriorly tapered mandrel slidable over said spindle, a plurality of interiorly tapered outwardly yielding sector members embracing said mandrel, abrasive stones carried by said sector members, and means for advancing said mandrd along the length of said spindle to expand said sector members and cause said abrasive stones to engage the wall of a cylinder.

2. In a grinding tool, a spindle member having a threaded section, a tapered mandrel longitudinally slidable upon said spindle, a plurality of outwardly movable sector members having tapered sections coacting with said mandrel, abrasive stones carried by said sector members, and an adjusting nut located on the threaded section of said spindle, said nut having rotatable engagement with said mandrel and being held against longitudinal sliding thereon, whereby when said nut is turned, the mandrel will be advanced and will expand the sector members outwardly with respect to said spindle.

3. In a grinding tool, a spindle member having a. threaded section, a tapered mandrel longitudinally slidable upon said spindle, a plurality of outwardly movable sector members having tapered sections coactlng 'with said mandrel, abrasive stones carried by said sector members, spring means for exerting contracting pressure upon said sector members, and an adjusting nut located on the threaded section of said spindle, said nut having rotatable engagement with said mandrel and being held against longitudinal sliding thereon, whereby when said nut is turned, the mandrel will be advanced and will expand the sector men bers outwardly with respect to said spindle.

4. In a grinding tool, a spindle member having a threaded section, a tapered mandrel longitudinally slidable upon said spindle, a plurality of outwardly movable sector members having tapered sections coacting with said mandrel, abrasive stones carried by said sector members, a plurality of split spring clips for exerting contracting pressure upon said sector members, and an adjusting nut located on the threaded section of said spindle, said nut having rotatable engagement with said mandrel and being held against longitudinal sliding thereon, whereby when said nut is turned, the mandrel will be advanced and will expand the sector members outwardly with respect to said spindle.

5. In a grinding tool, a spindle member, an exteriorly tapered mandrel slidable over said spindle, a plurality of interiorly tapered outwardly yielding sector members embracing said mandrel, abrasive stones carried by said sector members, and means for advancing said mandrel along the length of said spindle to expand said sector members and cause said abrasive stones to engage the wall of a cylinder, said sector members having non-rotatable connection with said spindle.

6. In a cylinder grinding tool, a driving spindle, a tapered mandrel slidable over said spindle and having a longitudinal slot, a radial guide pin on said spindle projecting through said slot, a sec tor member carrying abrasive material outwardly movable on said guide pin and having a complementary tapered section engaging said tapered mandrel, and means on said spindle for moving said mandrel along said spindle to expand said sector member outwardly.

7. In a cylinder grinding tool, a driving spindle, a tapered mandrel slidable over said spindle and having a longitudinal slot, a radial guide pin on said spindle projecting through said slot, a sector member carrying abrasive .material outwardly movable on said guide pin and having a complementary tapered section engaging said tapered mandrel, and screw means on said spindle for moving said mandrel along said spindle to expond laid sector member outwardly.

8. In a grinding tool, a driving spindle having a threaded section, a tapered mandrel slidable with respect to said spindle and having a plurality of longitudinal slots, said spindle having radial guide members projecting through said slots, a plurality of sector members carrying abrasive material outwardly movable on said guides and having complementary beveled sections for engaging said tapered mandrel, a nut screwed on said threaded section and having ro-' outwardly slidable on said guide pins, inwardly yieldable shoe members carrying abrasive material adjustably secured to said sectorblocks,means carried by said spindle for moving said mandrel longitudinally along said spindle to expand said sector blocks and force said abrasive carrying shoes against the work.

10. In a grinding tool, a driving spindle, a tapered mandrel slidable upon said spindle and having a plurality of longitudinal .slots, radial guide pins on said spindle projecting through said slots, a plurality of interiorly tapered sector blocks outwardlyslidable on said guide pins, inwardly yieldable shoe members carrying abrasive material resiliently connected to said sector blocks, means carried by said spindle for moving said mandrel longitudinally along said spindle to expand said sector blocks and force said abrasive carrying shoes against the work.

11. In a grinding tool, a driving spindle, a tapered mandrel slidable over said spindle and having a plurality of longitudinal slots, radial guide pins carried by said spindle and projecting through said slots, a plurality of intemally tapered sector blocks outwardly slidable on said guide pins, 9. cylindrically arranged set of arcuate abrasive carrying shoe members located outside said sector blocks, means for permittingsaid shoe members to be resiliently compressed inwardly toward said sector blocks but limiting the outward movement thereof, and means on said spindle for moving said mandrel longitudinally along said spindle to expand said shoe members against the work to be abraded.

12. In a cylinder grinding tool, a driving spindinally upon said spindle, a radial guide pin car. ried by said spindle and extending outwardly through said mandrel, a pluralityof spaced sector blocks surrounding said mandrel, each of said blocks having a headed adjustable screw stud projecting outwardly therefrom, abrasive shoe members carried by said blocks and having apertures fitted over said studs, compression springs surrounding said studs, and means to move said mandrel along said spindle to expand said sector blocks and force the abrasive shoe members against the work to be abraded.

13. In a cylinder grinding tool, a driving spindle, a slotted tapered mandrel slidable longitudinally upon said spindle, a radial guide pin carried by said spindle and extending outwardly through said mandrel, a plurality of spaced sector blocks surrounding said mandrel, each of said blocks having a headed stud projecting outwardly therefrom, abrasive shoe members carried by said blocks and having apertures fitted over said studs, compression springs surrounding said studs, and means to move said mandrel along said spindle to expand said sector blocks and force the abrasive shoe members against the work-to be abraded.

14. In a cylinder grinding tool, a driving spindie, a slotted tapered mandrel slidable longitudinally upon said spindle, a radial guide pin carried by said spindle and extending outwardly through said mandrel, a plurality of spaced sector blocks surrounding said mandrel, each of said blocks having a headed adjustable screw ,stud projecting outwardly therefrom, abrasive shoe members carried by said blocks and having apertures fitted over said studs, compression springs die, a slotted tapered mandrel slidable longitu surrounding said studs, means to lock said screw studs in adjusted position, and means to move said mandrel along said spindle to expand said sector blocks and force the abrasive shoe members against the work to be abraded.

15. In a grinding tool, a driving spindle having a threaded section, a traveling tapered mandrel slidably mounted on said spindle, an expansible abrading element adapted to be forced into engagement with the work to be abraded by the longitudinal movement of said mandrel, a

'nut screwed on said threaded section, said mandrel having a groove located inside said nut, a pin projecting into said groove from said nut, and a split ring on the exterior of said nut for retaining said pin in position within said groove.

MICHAEL KAMINSKY. 

